Synthesis and Tribological Behavior of Nanocomposite Polymer Layers

  • Tsukruk, V.V. (Department of Materials Science & Engineering, Iowa State University) ;
  • Ahn, Hyo-Sok (Tribology Research Center, Korea Institute of Science and Technology) ;
  • Julthongpiput, D. (Department of Materials Science & Engineering, Iowa State University) ;
  • Kim, Doo-In (Tribology Research Center, Korea Institute of Science and Technology)
  • 발행 : 2002.10.21

초록

We report results on microtribological studies of chemically grafted nanoscale polymer layers of different architecture with thickness below 30 nm. We have fabricated the molecular lubrication coatings from elastomeric tri-block copolymers and tested two different designs of corresponding nanocomposite coatings. We observed a significant reduction of friction forces and an increase of the wear stability when a minute amount of oil was trapped within the grafted polymer layer. These polymer gel layers exhibited a very steady friction response and a small value of the coefficient of friction as compared to the initial polymer coating. A polymer 'triplex' coating has been formed by a multiple grafting technique. The unique design of this layer Includes a hard-soft-hard architecture with a compliant rubber interlayer mediating localized stresses transferred through the topmost hard layer. This architecture provides a non-linear mechanical response under a normal compression stress and allows additional dissipation of mechanical energy via the elastic rubber interlayer.

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